If the rooms empty, mask the skirting boards and use a compressor and sprayer. Good for fences, too! And quick.
Don’t do what I did once: pull the floorboards up to put some pipes in for the heating, then turn your back for a minute. Laid in bed later thinking “We haven’t heard the cat come in”. Prised up floorboards again, stuck a torch down to find a pair of ginger eyes staring back at me...
